scholarly journals The observed discordances in cosmology signaling new Physics

2020 ◽  
Author(s):  
Haichao Zhang
Keyword(s):  
Cold Dark Matter ◽  
New Physics ◽  
Cosmic Acceleration ◽  
Late Time ◽  
Absolute Mass ◽  
Cold Dark Matter Model ◽  
Matter Model ◽  
Dark Matter Model ◽  
Measured Mass ◽  
Cosmic Model

Abstract The measured values for the cosmic expansion rate, the cosmic radius, the cosmic age, etc. vary with a direct or an indirect methodology. These discrepancies known as the cosmological crisis imply the existence of a new physical field. The coupling of matter to the field causes the ratio between a being measured mass of matter and a reference mass to vary with the field. Any experiment can only measure the relative ratio rather than the absolute mass of matter. Apparently, there are two representations in describing the field dependence of the ratio: the reference (being measured) mass varies with the field while the being measured (reference) mass does not. Therefore, the measured value of every quantity depends on the choice of the representations. A representation is selected based on the conscious or unconscious assumptions in an experiment. This new field can resolve the discrepancies as well as drive the late-time cosmic acceleration. The new closed cosmic model here can remove the tensions in the standard cold dark matter model with Λ being the cosmological constant.

scholarly journals The observed discordances in cosmology signaling new Physics

2020 ◽  
Author(s):  
Haichao Zhang
Keyword(s):  
Cold Dark Matter ◽  
New Physics ◽  
Cosmic Acceleration ◽  
Late Time ◽  
Absolute Mass ◽  
Cold Dark Matter Model ◽  
Matter Model ◽  
Dark Matter Model ◽  
Measured Mass ◽  
Cosmic Model

Abstract The measured values for the cosmic expansion rate, the cosmic radius, the cosmic age, etc. vary with a direct or an indirect methodology. These discrepancies known as the cosmological crisis imply the existence of a new physical field. The coupling of matter to the field causes the ratio between a being measured mass of matter and a reference mass to vary with the field. Any experiment can only measure the relative ratio rather than the absolute mass of matter. Apparently, there are two representations in describing the field dependence of the ratio: the reference (being measured) mass varies with the field while the being measured (reference) mass does not. Therefore, the measured value of every quantity depends on the choice of the representations. A representation is selected based on the conscious or unconscious assumptions in an experiment. This new field can resolve the discrepancies as well as drive the late-time cosmic acceleration. The new closed cosmic model here can remove the tensions in the standard cold dark matter model with Λ being the cosmological constant.

Velocity Bias in a Λ Cold Dark Matter Model

2000 ◽  
Vol 539 (2) ◽  
pp. 561-569 ◽  
Author(s):  
Pedro Colin ◽  
Anatoly A. Klypin ◽  
Andrey V. Kravtsov
Keyword(s):  
Dark Matter ◽  
Cold Dark Matter ◽  
Cold Dark Matter Model ◽  
Matter Model ◽  
Dark Matter Model ◽  
Velocity Bias

scholarly journals The Milky Way’s halo and subhaloes in self-interacting dark matter

2019 ◽  
Vol 490 (2) ◽  
pp. 2117-2123 ◽  
Author(s):  
Victor H Robles ◽  
Tyler Kelley ◽  
James S Bullock ◽  
Manoj Kaplinghat
Keyword(s):  
Dark Matter ◽  
Cold Dark Matter ◽  
Elastic Cross Section ◽  
Too Big To Fail ◽  
Density Profiles ◽  
Potential Core ◽  
Cold Dark Matter Model ◽  
Matter Model ◽  
Satellite Galaxies ◽  
Dark Matter Model

ABSTRACT We perform high-resolution simulations of an MW-like galaxy in a self-interacting cold dark matter model with elastic cross-section over mass of $1~\rm cm^2\, g^{-1}$ (SIDM) and compare to a model without self-interactions (CDM). We run our simulations with and without a time-dependent embedded potential to capture effects of the baryonic disc and bulge contributions. The CDM and SIDM simulations with the embedded baryonic potential exhibit remarkably similar host halo profiles, subhalo abundances, and radial distributions within the virial radius. The SIDM host halo is denser in the centre than the CDM host and has no discernible core, in sharp contrast to the case without the baryonic potential (core size ${\sim}7 \, \rm kpc$). The most massive subhaloes (with $V_{\mathrm{peak}}\gt 20 \, \rm km\, s^{-1}$) in our SIDM simulations, expected to host the classical satellite galaxies, have density profiles that are less dense than their CDM analogues at radii less than 500 pc but the deviation diminishes for less massive subhaloes. With the baryonic potential included in the CDM and SIDM simulations, the most massive subhaloes do not display the too-big-to-fail problem. However, the least dense among the massive subhaloes in both these simulations tend to have the smallest pericenter values, a trend that is not apparent among the bright MW satellite galaxies.

scholarly journals SIMULATED VOID GALAXIES IN THE STANDARD COLD DARK MATTER MODEL

2011 ◽  
Vol 735 (2) ◽  
pp. 132 ◽  
Author(s):  
Kathryn Kreckel ◽  
M. Ryan Joung ◽  
Renyue Cen
Keyword(s):  
Dark Matter ◽  
Cold Dark Matter ◽  
Cold Dark Matter Model ◽  
Void Galaxies ◽  
Matter Model ◽  
Dark Matter Model

Redshift space clustering of galaxies and cold dark matter model

1993 ◽  
Vol 408 ◽  
pp. L77 ◽  
Author(s):  
Neta A. Bahcall ◽  
Renyue Cen ◽  
Mirt Gramann
Keyword(s):  
Dark Matter ◽  
Cold Dark Matter ◽  
Cold Dark Matter Model ◽  
Matter Model ◽  
Dark Matter Model

Statefinder diagnostic for exponential harmonic field

2020 ◽  
Vol 35 (26) ◽  
pp. 2050161
Author(s):  
A. D. Kanfon ◽  
F. Mavoa ◽  
G. Koto N’Gobi
Keyword(s):  
Dark Matter ◽  
Numerical Analysis ◽  
Cold Dark Matter ◽  
Specific Method ◽  
Statefinder Parameters ◽  
Harmonic Field ◽  
Cold Dark Matter Model ◽  
Matter Model ◽  
The Universe ◽  
Dark Matter Model

The dynamic study of the harmonic exponential field has been made using the statefinder diagnostic. By the use of a specific method, we find out the statefinder parameters [Formula: see text], [Formula: see text] according to the deceleration parameter and the redshift. The numerical analysis of these parameters brings out the transition between the accelerated and decelerated phases of the universe. There is also an attracting effect from the SCDM (Standard Cold Dark Matter) model toward the LCDM model ([Formula: see text]CDM). In view of the results this study allows us to classify the exponential harmonic field among the quintessential models.

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